{
 "_meta": {
  "what": "Delhi weekly mean PM2.5 (ug/m3) from CPCB monitors, one series per May-to-April year, with a per-winter test of whether the winter has two peaks.",
  "source": "India Air Quality Database, XKDR Forum (https://airquality.xkdr.org), CC BY 4.0; CPCB continuous monitoring network. Built by scripts/build-delhi-weekly.py.",
  "window": "May 2018 to August 2025; the CPCB feed in the archive ends on 1 September 2025.",
  "weeks": "seven-day blocks counted from 1 May; week 0 is 1 to 7 May",
  "rules": {
   "station_day_min_hours": 18,
   "city_day_min_stations": 10,
   "week_min_days": 5,
   "early_weeks": [
    24,
    29
   ],
   "late_weeks": [
    31,
    38
   ]
  },
  "complete_means": "every week from 16 October to 28 January present (weeks 24 to 38)",
  "not_aqi": "A weekly mean read against CPCB 24-hour breakpoints is a guide, not an AQI day.",
  "gap": "No CPCB data in the archive for January to March 2025, so winter 2024-25 is never counted and is drawn to December only.",
  "network": "Reporting stations grew over the window, so levels across years are not like for like; the shape within a winter is.",
  "lockdown": "April and May 2020 sit inside the 2019-20 and 2020-21 years."
 },
 "cycles": [
  {
   "label": "2018-19",
   "start": "2018-05-01",
   "complete": true,
   "weeks": [
    {
     "w": 0,
     "mean": 74.4,
     "days": 7,
     "stations_min": 27,
     "stations_max": 31
    },
    {
     "w": 1,
     "mean": 91.0,
     "days": 7,
     "stations_min": 24,
     "stations_max": 30
    },
    {
     "w": 2,
     "mean": 87.4,
     "days": 7,
     "stations_min": 25,
     "stations_max": 28
    },
    {
     "w": 3,
     "mean": 106.0,
     "days": 7,
     "stations_min": 26,
     "stations_max": 28
    },
    {
     "w": 4,
     "mean": 71.1,
     "days": 7,
     "stations_min": 27,
     "stations_max": 30
    },
    {
     "w": 5,
     "mean": 65.6,
     "days": 7,
     "stations_min": 24,
     "stations_max": 30
    },
    {
     "w": 6,
     "mean": 149.3,
     "days": 7,
     "stations_min": 28,
     "stations_max": 30
    },
    {
     "w": 7,
     "mean": 66.4,
     "days": 7,
     "stations_min": 25,
     "stations_max": 30
    },
    {
     "w": 8,
     "mean": 37.2,
     "days": 7,
     "stations_min": 22,
     "stations_max": 29
    },
    {
     "w": 9,
     "mean": 57.3,
     "days": 7,
     "stations_min": 29,
     "stations_max": 33
    },
    {
     "w": 10,
     "mean": 38.6,
     "days": 7,
     "stations_min": 31,
     "stations_max": 33
    },
    {
     "w": 11,
     "mean": 36.1,
     "days": 7,
     "stations_min": 33,
     "stations_max": 34
    },
    {
     "w": 12,
     "mean": 35.6,
     "days": 7,
     "stations_min": 30,
     "stations_max": 33
    },
    {
     "w": 13,
     "mean": 60.9,
     "days": 7,
     "stations_min": 33,
     "stations_max": 34
    },
    {
     "w": 14,
     "mean": 36.3,
     "days": 7,
     "stations_min": 30,
     "stations_max": 34
    },
    {
     "w": 15,
     "mean": 42.5,
     "days": 7,
     "stations_min": 31,
     "stations_max": 35
    },
    {
     "w": 16,
     "mean": 26.7,
     "days": 7,
     "stations_min": 31,
     "stations_max": 35
    },
    {
     "w": 17,
     "mean": 40.7,
     "days": 7,
     "stations_min": 32,
     "stations_max": 36
    },
    {
     "w": 18,
     "mean": 41.2,
     "days": 7,
     "stations_min": 29,
     "stations_max": 35
    },
    {
     "w": 19,
     "mean": 36.1,
     "days": 7,
     "stations_min": 32,
     "stations_max": 34
    },
    {
     "w": 20,
     "mean": 44.2,
     "days": 7,
     "stations_min": 33,
     "stations_max": 35
    },
    {
     "w": 21,
     "mean": 64.3,
     "days": 7,
     "stations_min": 32,
     "stations_max": 35
    },
    {
     "w": 22,
     "mean": 90.8,
     "days": 7,
     "stations_min": 31,
     "stations_max": 36
    },
    {
     "w": 23,
     "mean": 96.8,
     "days": 7,
     "stations_min": 31,
     "stations_max": 35
    },
    {
     "w": 24,
     "mean": 141.4,
     "days": 7,
     "stations_min": 33,
     "stations_max": 36
    },
    {
     "w": 25,
     "mean": 188.4,
     "days": 7,
     "stations_min": 32,
     "stations_max": 35
    },
    {
     "w": 26,
     "mean": 221.0,
     "days": 7,
     "stations_min": 32,
     "stations_max": 35
    },
    {
     "w": 27,
     "mean": 264.3,
     "days": 7,
     "stations_min": 27,
     "stations_max": 36
    },
    {
     "w": 28,
     "mean": 159.6,
     "days": 7,
     "stations_min": 35,
     "stations_max": 37
    },
    {
     "w": 29,
     "mean": 171.9,
     "days": 7,
     "stations_min": 35,
     "stations_max": 37
    },
    {
     "w": 30,
     "mean": 183.8,
     "days": 7,
     "stations_min": 35,
     "stations_max": 37
    },
    {
     "w": 31,
     "mean": 214.9,
     "days": 7,
     "stations_min": 35,
     "stations_max": 37
    },
    {
     "w": 32,
     "mean": 164.1,
     "days": 7,
     "stations_min": 36,
     "stations_max": 37
    },
    {
     "w": 33,
     "mean": 290.8,
     "days": 7,
     "stations_min": 36,
     "stations_max": 37
    },
    {
     "w": 34,
     "mean": 279.2,
     "days": 7,
     "stations_min": 35,
     "stations_max": 37
    },
    {
     "w": 35,
     "mean": 261.7,
     "days": 7,
     "stations_min": 36,
     "stations_max": 37
    },
    {
     "w": 36,
     "mean": 202.4,
     "days": 7,
     "stations_min": 34,
     "stations_max": 36
    },
    {
     "w": 37,
     "mean": 250.9,
     "days": 7,
     "stations_min": 35,
     "stations_max": 36
    },
    {
     "w": 38,
     "mean": 110.7,
     "days": 7,
     "stations_min": 29,
     "stations_max": 37
    },
    {
     "w": 39,
     "mean": 170.0,
     "days": 7,
     "stations_min": 35,
     "stations_max": 37
    },
    {
     "w": 40,
     "mean": 138.3,
     "days": 7,
     "stations_min": 36,
     "stations_max": 37
    },
    {
     "w": 41,
     "mean": 143.2,
     "days": 7,
     "stations_min": 28,
     "stations_max": 37
    },
    {
     "w": 42,
     "mean": 87.5,
     "days": 7,
     "stations_min": 31,
     "stations_max": 37
    },
    {
     "w": 43,
     "mean": 81.5,
     "days": 7,
     "stations_min": 13,
     "stations_max": 36
    },
    {
     "w": 44,
     "mean": 83.3,
     "days": 7,
     "stations_min": 28,
     "stations_max": 37
    },
    {
     "w": 45,
     "mean": 85.4,
     "days": 7,
     "stations_min": 36,
     "stations_max": 37
    },
    {
     "w": 46,
     "mean": 73.6,
     "days": 7,
     "stations_min": 34,
     "stations_max": 37
    },
    {
     "w": 47,
     "mean": 86.3,
     "days": 7,
     "stations_min": 34,
     "stations_max": 37
    },
    {
     "w": 48,
     "mean": 108.0,
     "days": 7,
     "stations_min": 33,
     "stations_max": 36
    },
    {
     "w": 49,
     "mean": 69.5,
     "days": 7,
     "stations_min": 35,
     "stations_max": 37
    },
    {
     "w": 50,
     "mean": 70.0,
     "days": 7,
     "stations_min": 33,
     "stations_max": 37
    },
    {
     "w": 51,
     "mean": 85.0,
     "days": 7,
     "stations_min": 29,
     "stations_max": 34
    }
   ],
   "peaks": {
    "early": {
     "week": 27,
     "start": "6 Nov",
     "mean": 264.3
    },
    "late": {
     "week": 33,
     "start": "18 Dec",
     "mean": 290.8
    },
    "weeks_over_severe": {
     "early": 1,
     "late": 4
    },
    "trough": {
     "week": 28,
     "start": "13 Nov",
     "mean": 159.6
    },
    "dip": 0.396
   }
  },
  {
   "label": "2019-20",
   "start": "2019-05-01",
   "complete": true,
   "weeks": [
    {
     "w": 0,
     "mean": 95.5,
     "days": 7,
     "stations_min": 13,
     "stations_max": 34
    },
    {
     "w": 1,
     "mean": 126.6,
     "days": 7,
     "stations_min": 33,
     "stations_max": 36
    },
    {
     "w": 2,
     "mean": 78.3,
     "days": 7,
     "stations_min": 32,
     "stations_max": 36
    },
    {
     "w": 3,
     "mean": 61.7,
     "days": 7,
     "stations_min": 32,
     "stations_max": 36
    },
    {
     "w": 4,
     "mean": 77.0,
     "days": 7,
     "stations_min": 32,
     "stations_max": 35
    },
    {
     "w": 5,
     "mean": 80.2,
     "days": 7,
     "stations_min": 32,
     "stations_max": 35
    },
    {
     "w": 6,
     "mean": 51.4,
     "days": 7,
     "stations_min": 34,
     "stations_max": 37
    },
    {
     "w": 7,
     "mean": 54.6,
     "days": 7,
     "stations_min": 33,
     "stations_max": 36
    },
    {
     "w": 8,
     "mean": 63.5,
     "days": 7,
     "stations_min": 35,
     "stations_max": 37
    },
    {
     "w": 9,
     "mean": 41.5,
     "days": 7,
     "stations_min": 34,
     "stations_max": 37
    },
    {
     "w": 10,
     "mean": 60.2,
     "days": 7,
     "stations_min": 34,
     "stations_max": 36
    },
    {
     "w": 11,
     "mean": 52.0,
     "days": 7,
     "stations_min": 30,
     "stations_max": 37
    },
    {
     "w": 12,
     "mean": 31.0,
     "days": 7,
     "stations_min": 36,
     "stations_max": 37
    },
    {
     "w": 13,
     "mean": 38.2,
     "days": 7,
     "stations_min": 33,
     "stations_max": 37
    },
    {
     "w": 14,
     "mean": 22.7,
     "days": 7,
     "stations_min": 33,
     "stations_max": 35
    },
    {
     "w": 15,
     "mean": 26.4,
     "days": 7,
     "stations_min": 32,
     "stations_max": 34
    },
    {
     "w": 16,
     "mean": 43.0,
     "days": 7,
     "stations_min": 33,
     "stations_max": 35
    },
    {
     "w": 17,
     "mean": 47.1,
     "days": 7,
     "stations_min": 33,
     "stations_max": 35
    },
    {
     "w": 18,
     "mean": 47.5,
     "days": 7,
     "stations_min": 31,
     "stations_max": 36
    },
    {
     "w": 19,
     "mean": 49.7,
     "days": 7,
     "stations_min": 32,
     "stations_max": 35
    },
    {
     "w": 20,
     "mean": 33.1,
     "days": 7,
     "stations_min": 32,
     "stations_max": 36
    },
    {
     "w": 21,
     "mean": 24.5,
     "days": 7,
     "stations_min": 33,
     "stations_max": 36
    },
    {
     "w": 22,
     "mean": 49.0,
     "days": 7,
     "stations_min": 36,
     "stations_max": 37
    },
    {
     "w": 23,
     "mean": 109.4,
     "days": 7,
     "stations_min": 34,
     "stations_max": 37
    },
    {
     "w": 24,
     "mean": 105.7,
     "days": 7,
     "stations_min": 33,
     "stations_max": 35
    },
    {
     "w": 25,
     "mean": 193.9,
     "days": 7,
     "stations_min": 34,
     "stations_max": 37
    },
    {
     "w": 26,
     "mean": 331.2,
     "days": 7,
     "stations_min": 35,
     "stations_max": 37
    },
    {
     "w": 27,
     "mean": 202.6,
     "days": 7,
     "stations_min": 36,
     "stations_max": 37
    },
    {
     "w": 28,
     "mean": 239.4,
     "days": 7,
     "stations_min": 36,
     "stations_max": 37
    },
    {
     "w": 29,
     "mean": 152.0,
     "days": 7,
     "stations_min": 34,
     "stations_max": 37
    },
    {
     "w": 30,
     "mean": 94.2,
     "days": 7,
     "stations_min": 34,
     "stations_max": 37
    },
    {
     "w": 31,
     "mean": 227.3,
     "days": 7,
     "stations_min": 34,
     "stations_max": 37
    },
    {
     "w": 32,
     "mean": 146.8,
     "days": 7,
     "stations_min": 32,
     "stations_max": 36
    },
    {
     "w": 33,
     "mean": 222.2,
     "days": 7,
     "stations_min": 35,
     "stations_max": 36
    },
    {
     "w": 34,
     "mean": 256.8,
     "days": 7,
     "stations_min": 32,
     "stations_max": 36
    },
    {
     "w": 35,
     "mean": 225.7,
     "days": 7,
     "stations_min": 33,
     "stations_max": 35
    },
    {
     "w": 36,
     "mean": 147.3,
     "days": 7,
     "stations_min": 35,
     "stations_max": 36
    },
    {
     "w": 37,
     "mean": 140.1,
     "days": 7,
     "stations_min": 35,
     "stations_max": 36
    },
    {
     "w": 38,
     "mean": 142.8,
     "days": 7,
     "stations_min": 33,
     "stations_max": 36
    },
    {
     "w": 39,
     "mean": 118.0,
     "days": 7,
     "stations_min": 33,
     "stations_max": 36
    },
    {
     "w": 40,
     "mean": 153.0,
     "days": 7,
     "stations_min": 32,
     "stations_max": 36
    },
    {
     "w": 41,
     "mean": 120.7,
     "days": 7,
     "stations_min": 33,
     "stations_max": 36
    },
    {
     "w": 42,
     "mean": 94.0,
     "days": 7,
     "stations_min": 34,
     "stations_max": 36
    },
    {
     "w": 43,
     "mean": 88.6,
     "days": 7,
     "stations_min": 34,
     "stations_max": 36
    },
    {
     "w": 44,
     "mean": 55.7,
     "days": 7,
     "stations_min": 31,
     "stations_max": 35
    },
    {
     "w": 45,
     "mean": 59.3,
     "days": 7,
     "stations_min": 31,
     "stations_max": 36
    },
    {
     "w": 46,
     "mean": 74.0,
     "days": 7,
     "stations_min": 33,
     "stations_max": 36
    },
    {
     "w": 47,
     "mean": 31.8,
     "days": 7,
     "stations_min": 28,
     "stations_max": 32
    },
    {
     "w": 48,
     "mean": 38.9,
     "days": 7,
     "stations_min": 26,
     "stations_max": 30
    },
    {
     "w": 49,
     "mean": 47.7,
     "days": 7,
     "stations_min": 31,
     "stations_max": 32
    },
    {
     "w": 50,
     "mean": 43.4,
     "days": 7,
     "stations_min": 27,
     "stations_max": 30
    },
    {
     "w": 51,
     "mean": 45.0,
     "days": 7,
     "stations_min": 28,
     "stations_max": 34
    }
   ],
   "peaks": {
    "early": {
     "week": 26,
     "start": "30 Oct",
     "mean": 331.2
    },
    "late": {
     "week": 34,
     "start": "25 Dec",
     "mean": 256.8
    },
    "weeks_over_severe": {
     "early": 1,
     "late": 1
    },
    "trough": {
     "week": 30,
     "start": "27 Nov",
     "mean": 94.2
    },
    "dip": 0.633
   }
  },
  {
   "label": "2020-21",
   "start": "2020-05-01",
   "complete": true,
   "weeks": [
    {
     "w": 0,
     "mean": 43.1,
     "days": 7,
     "stations_min": 27,
     "stations_max": 31
    },
    {
     "w": 1,
     "mean": 50.8,
     "days": 7,
     "stations_min": 28,
     "stations_max": 33
    },
    {
     "w": 2,
     "mean": 80.4,
     "days": 7,
     "stations_min": 31,
     "stations_max": 33
    },
    {
     "w": 3,
     "mean": 60.4,
     "days": 7,
     "stations_min": 30,
     "stations_max": 36
    },
    {
     "w": 4,
     "mean": 39.5,
     "days": 7,
     "stations_min": 34,
     "stations_max": 36
    },
    {
     "w": 5,
     "mean": 49.6,
     "days": 7,
     "stations_min": 32,
     "stations_max": 36
    },
    {
     "w": 6,
     "mean": 49.3,
     "days": 7,
     "stations_min": 32,
     "stations_max": 35
    },
    {
     "w": 7,
     "mean": 38.7,
     "days": 7,
     "stations_min": 33,
     "stations_max": 36
    },
    {
     "w": 8,
     "mean": 49.8,
     "days": 7,
     "stations_min": 33,
     "stations_max": 35
    },
    {
     "w": 9,
     "mean": 38.5,
     "days": 7,
     "stations_min": 33,
     "stations_max": 35
    },
    {
     "w": 10,
     "mean": 30.6,
     "days": 7,
     "stations_min": 31,
     "stations_max": 36
    },
    {
     "w": 11,
     "mean": 29.2,
     "days": 7,
     "stations_min": 27,
     "stations_max": 34
    },
    {
     "w": 12,
     "mean": 31.0,
     "days": 7,
     "stations_min": 31,
     "stations_max": 35
    },
    {
     "w": 13,
     "mean": 28.5,
     "days": 7,
     "stations_min": 33,
     "stations_max": 35
    },
    {
     "w": 14,
     "mean": 30.0,
     "days": 7,
     "stations_min": 26,
     "stations_max": 34
    },
    {
     "w": 15,
     "mean": 24.4,
     "days": 7,
     "stations_min": 30,
     "stations_max": 33
    },
    {
     "w": 16,
     "mean": 16.9,
     "days": 7,
     "stations_min": 28,
     "stations_max": 35
    },
    {
     "w": 17,
     "mean": 24.1,
     "days": 7,
     "stations_min": 31,
     "stations_max": 36
    },
    {
     "w": 18,
     "mean": 38.5,
     "days": 7,
     "stations_min": 30,
     "stations_max": 35
    },
    {
     "w": 19,
     "mean": 60.2,
     "days": 7,
     "stations_min": 32,
     "stations_max": 36
    },
    {
     "w": 20,
     "mean": 45.8,
     "days": 7,
     "stations_min": 34,
     "stations_max": 36
    },
    {
     "w": 21,
     "mean": 56.1,
     "days": 7,
     "stations_min": 34,
     "stations_max": 36
    },
    {
     "w": 22,
     "mean": 78.9,
     "days": 7,
     "stations_min": 32,
     "stations_max": 35
    },
    {
     "w": 23,
     "mean": 118.5,
     "days": 7,
     "stations_min": 32,
     "stations_max": 34
    },
    {
     "w": 24,
     "mean": 124.7,
     "days": 7,
     "stations_min": 30,
     "stations_max": 34
    },
    {
     "w": 25,
     "mean": 197.7,
     "days": 7,
     "stations_min": 33,
     "stations_max": 35
    },
    {
     "w": 26,
     "mean": 231.9,
     "days": 7,
     "stations_min": 33,
     "stations_max": 35
    },
    {
     "w": 27,
     "mean": 326.3,
     "days": 7,
     "stations_min": 28,
     "stations_max": 35
    },
    {
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   "n_cycles": 6
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  {
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  },
  {
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   "max": 184.9,
   "n_cycles": 6
  },
  {
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   "mean": 127.2,
   "min": 100.3,
   "max": 153.0,
   "n_cycles": 6
  },
  {
   "w": 41,
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   "min": 115.9,
   "max": 175.5,
   "n_cycles": 6
  },
  {
   "w": 42,
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   "n_cycles": 6
  },
  {
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   "min": 63.7,
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  },
  {
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  },
  {
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  },
  {
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   "max": 103.5,
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  },
  {
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  },
  {
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  },
  {
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   "max": 100.1,
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  },
  {
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 ],
 "summary": {
  "complete_winters": 6,
  "labels": [
   "2018-19",
   "2019-20",
   "2020-21",
   "2021-22",
   "2022-23",
   "2023-24"
  ]
 },
 "tests": {
  "shuffle": {
   "what": "each winter's own weekly values (weeks 24 to 38) put in random order, then the same dip measured",
   "seed": 1,
   "draws": 24000,
   "observed_dip": [
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    0.633,
    0.409,
    0.401,
    0.524,
    0.324
   ],
   "observed_median": 0.409,
   "null_median": 0.499,
   "null_share_at_least_30pct": 0.914
  },
  "bootstrap": {
   "what": "resampling the winters with replacement, the dip in the average series",
   "seed": 7,
   "draws": 5000,
   "p5": 0.276,
   "median": 0.351,
   "p95": 0.424
  },
  "timing": {
   "early_peak_weeks": [
    27,
    26,
    27,
    27,
    26,
    26
   ],
   "late_peak_weeks": [
    33,
    34,
    33,
    33,
    36,
    34
   ],
   "early_peak_starts": [
    "6 Nov",
    "30 Oct",
    "6 Nov",
    "6 Nov",
    "30 Oct",
    "30 Oct"
   ],
   "late_peak_starts": [
    "18 Dec",
    "25 Dec",
    "18 Dec",
    "18 Dec",
    "8 Jan",
    "25 Dec"
   ]
  },
  "flattening": {
   "mean_of_winter_early_peaks": 291.3,
   "mean_of_winter_late_peaks": 247.4,
   "peak_of_average_early": 254.0,
   "peak_of_average_late": 237.5
  }
 }
}